Abstract: A theft-resistant assembly for screw base compact fluorescent lamps of the type having at least one U-tube integrated with and extending from an adapter member. The adapter member has a threaded portion for engagement with a lamp socket. The assembly includes a ring for disposition around a protrusion of the lamp socket protrusion, arms upstanding from the ring with each of the arms having an arm connector thereon, a collar for disposition around the U-tube and for engagement with a top surface of the adapter member, and legs depending from the collar with each of the legs having a leg connector thereon. The leg connectors are lockingly engageable with the arm connectors, respectively, to lock the collar to the ring, whereby to lock the adapter member to the socket.